<?php

/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Loader
 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Loader.php 24593 2012-01-05 20:35:02Z matthew $
 */
/**
 * Static methods for loading classes and files.
 *
 * @category   Zend
 * @package    Zend_Loader
 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
if (!class_exists('Zend_Loader')) {///Fix bug optimizer+

	class Zend_Loader {

		/**
		 * Loads a class from a PHP file.  The filename must be formatted
		 * as "$class.php".
		 *
		 * If $dirs is a string or an array, it will search the directories
		 * in the order supplied, and attempt to load the first matching file.
		 *
		 * If $dirs is null, it will split the class name at underscores to
		 * generate a path hierarchy (e.g., "Zend_Example_Class" will map
		 * to "Zend/Example/Class.php").
		 *
		 * If the file was not found in the $dirs, or if no $dirs were specified,
		 * it will attempt to load it from PHP's include_path.
		 *
		 * @param string $class      - The full class name of a Zend component.
		 * @param string|array $dirs - OPTIONAL Either a path or an array of paths
		 *                             to search.
		 * @return void
		 * @throws Zend_Exception
		 */
		public static function loadClass($class, $dirs = null) {
			if (class_exists($class, false) || interface_exists($class, false)) {
				return;
			}

			if ((null !== $dirs) && !is_string($dirs) && !is_array($dirs)) {
				require_once 'Zend/Exception.php';
				throw new Zend_Exception('Directory argument must be a string or an array');
			}

			$file = self::standardiseFile($class);

			if (!empty($dirs)) {
				// use the autodiscovered path
				$dirPath = dirname($file);
				if (is_string($dirs)) {
					$dirs = explode(PATH_SEPARATOR, $dirs);
				}
				foreach ($dirs as $key => $dir) {
					if ($dir == '.') {
						$dirs[$key] = $dirPath;
					} else {
						$dir = rtrim($dir, '\\/');
						$dirs[$key] = $dir . DIRECTORY_SEPARATOR . $dirPath;
					}
				}
				$file = basename($file);
				self::loadFile($file, $dirs, true);
			} else {
				self::loadFile($file, null, true);
			}

			if (!class_exists($class, false) && !interface_exists($class, false)) {
				require_once 'Zend/Exception.php';
				throw new Zend_Exception("File \"$file\" does not exist or class \"$class\" was not found in the file");
			}
		}

		/**
		 * Loads a PHP file.  This is a wrapper for PHP's include() function.
		 *
		 * $filename must be the complete filename, including any
		 * extension such as ".php".  Note that a security check is performed that
		 * does not permit extended characters in the filename.  This method is
		 * intended for loading Zend Framework files.
		 *
		 * If $dirs is a string or an array, it will search the directories
		 * in the order supplied, and attempt to load the first matching file.
		 *
		 * If the file was not found in the $dirs, or if no $dirs were specified,
		 * it will attempt to load it from PHP's include_path.
		 *
		 * If $once is TRUE, it will use include_once() instead of include().
		 *
		 * @param  string        $filename
		 * @param  string|array  $dirs - OPTIONAL either a path or array of paths
		 *                       to search.
		 * @param  boolean       $once
		 * @return boolean
		 * @throws Zend_Exception
		 */
		public static function loadFile($filename, $dirs = null, $once = false) {
			self::_securityCheck($filename);

			/**
			 * Search in provided directories, as well as include_path
			 */
			$incPath = false;
			if (!empty($dirs) && (is_array($dirs) || is_string($dirs))) {
				if (is_array($dirs)) {
					$dirs = implode(PATH_SEPARATOR, $dirs);
				}
				$incPath = get_include_path();
				set_include_path($dirs . PATH_SEPARATOR . $incPath);
			}

			/**
			 * Try finding for the plain filename in the include_path.
			 */
			if ($once) {
				include_once $filename;
			} else {
				include $filename;
			}

			/**
			 * If searching in directories, reset include_path
			 */
			if ($incPath) {
				set_include_path($incPath);
			}

			return true;
		}

		/**
		 * Returns TRUE if the $filename is readable, or FALSE otherwise.
		 * This function uses the PHP include_path, where PHP's is_readable()
		 * does not.
		 *
		 * Note from ZF-2900:
		 * If you use custom error handler, please check whether return value
		 *  from error_reporting() is zero or not.
		 * At mark of fopen() can not suppress warning if the handler is used.
		 *
		 * @param string   $filename
		 * @return boolean
		 */
		public static function isReadable($filename) {
			if (is_readable($filename)) {
				// Return early if the filename is readable without needing the
				// include_path
				return true;
			}

			if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN'
					&& preg_match('/^[a-z]:/i', $filename)
			) {
				// If on windows, and path provided is clearly an absolute path,
				// return false immediately
				return false;
			}

			foreach (self::explodeIncludePath() as $path) {
				if ($path == '.') {
					if (is_readable($filename)) {
						return true;
					}
					continue;
				}
				$file = $path . '/' . $filename;
				if (is_readable($file)) {
					return true;
				}
			}
			return false;
		}

		/**
		 * Explode an include path into an array
		 *
		 * If no path provided, uses current include_path. Works around issues that
		 * occur when the path includes stream schemas.
		 *
		 * @param  string|null $path
		 * @return array
		 */
		public static function explodeIncludePath($path = null) {
			if (null === $path) {
				$path = get_include_path();
			}

			if (PATH_SEPARATOR == ':') {
				// On *nix systems, include_paths which include paths with a stream
				// schema cannot be safely explode'd, so we have to be a bit more
				// intelligent in the approach.
				$paths = preg_split('#:(?!//)#', $path);
			} else {
				$paths = explode(PATH_SEPARATOR, $path);
			}
			return $paths;
		}

		/**
		 * spl_autoload() suitable implementation for supporting class autoloading.
		 *
		 * Attach to spl_autoload() using the following:
		 * <code>
		 * spl_autoload_register(array('Zend_Loader', 'autoload'));
		 * </code>
		 *
		 * @deprecated Since 1.8.0
		 * @param  string $class
		 * @return string|false Class name on success; false on failure
		 */
		public static function autoload($class) {
			trigger_error(__CLASS__ . '::' . __METHOD__ . ' is deprecated as of 1.8.0 and will be removed with 2.0.0; use Zend_Loader_Autoloader instead', E_USER_NOTICE);
			try {
				@self::loadClass($class);
				return $class;
			} catch (Exception $e) {
				return false;
			}
		}

		/**
		 * Register {@link autoload()} with spl_autoload()
		 *
		 * @deprecated Since 1.8.0
		 * @param string $class (optional)
		 * @param boolean $enabled (optional)
		 * @return void
		 * @throws Zend_Exception if spl_autoload() is not found
		 * or if the specified class does not have an autoload() method.
		 */
		public static function registerAutoload($class = 'Zend_Loader', $enabled = true) {
			trigger_error(__CLASS__ . '::' . __METHOD__ . ' is deprecated as of 1.8.0 and will be removed with 2.0.0; use Zend_Loader_Autoloader instead', E_USER_NOTICE);
			require_once 'Zend/Loader/Autoloader.php';
			$autoloader = Zend_Loader_Autoloader::getInstance();
			$autoloader->setFallbackAutoloader(true);

			if ('Zend_Loader' != $class) {
				self::loadClass($class);
				$methods = get_class_methods($class);
				if (!in_array('autoload', (array) $methods)) {
					require_once 'Zend/Exception.php';
					throw new Zend_Exception("The class \"$class\" does not have an autoload() method");
				}

				$callback = array($class, 'autoload');

				if ($enabled) {
					$autoloader->pushAutoloader($callback);
				} else {
					$autoloader->removeAutoloader($callback);
				}
			}
		}

		/**
		 * Ensure that filename does not contain exploits
		 *
		 * @param  string $filename
		 * @return void
		 * @throws Zend_Exception
		 */
		protected static function _securityCheck($filename) {
			/**
			 * Security check
			 */
			if (preg_match('/[^a-z0-9\\/\\\\_.:-]/i', $filename)) {
				require_once 'Zend/Exception.php';
				throw new Zend_Exception('Security check: Illegal character in filename');
			}
		}

		/**
		 * Attempt to include() the file.
		 *
		 * include() is not prefixed with the @ operator because if
		 * the file is loaded and contains a parse error, execution
		 * will halt silently and this is difficult to debug.
		 *
		 * Always set display_errors = Off on production servers!
		 *
		 * @param  string  $filespec
		 * @param  boolean $once
		 * @return boolean
		 * @deprecated Since 1.5.0; use loadFile() instead
		 */
		protected static function _includeFile($filespec, $once = false) {
			if ($once) {
				return include_once $filespec;
			} else {
				return include $filespec;
			}
		}

		/**
		 * Standardise the filename.
		 *
		 * Convert the supplied filename into the namespace-aware standard,
		 * based on the Framework Interop Group reference implementation:
		 * http://groups.google.com/group/php-standards/web/psr-0-final-proposal
		 *
		 * The filename must be formatted as "$file.php".
		 *
		 * @param string $file - The file name to be loaded.
		 * @return string
		 */
		public static function standardiseFile($file) {
			$fileName = ltrim($file, '\\');
			$file = '';
			$namespace = '';
			if ($lastNsPos = strripos($fileName, '\\')) {
				$namespace = substr($fileName, 0, $lastNsPos);
				$fileName = substr($fileName, $lastNsPos + 1);
				$file = str_replace('\\', DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;
			}
			$file .= str_replace('_', DIRECTORY_SEPARATOR, $fileName) . '.php';
			return $file;
		}

	}

}